One thing I may think of, if the collar is for play, it helps to have a bit of “swivel” built into your ring. Having that Dring up oriented vertically rather than horizontally, and putting a steel O ring inside it might help.

I enjoy having that bit of flexibility, and to be quite frank, the clinking tinkling of steel on steel turns me on now 😉

Thats an idea I hadn’t thought of. Going to be working on another soon and will have to incorporate that. This DIY thing is slightly addictive. I have a few plans for other projects already working out in my head lol